Hello, whats is wrong with my solution?

Pytania dotyczące zadania

Wielowątkowość w Java, Poziom 5, Lekcja 9

Dyskutowane

public class Solution implements Thread.UncaughtExceptionHandler {

    @Override
    public void uncaughtException(Thread t, Throwable e) {

        t.interrupt();
        List<StackTraceElement> list = Arrays.asList(e.getStackTrace());
        Collections.reverse(list);
        for(StackTraceElement es :list){
            System.out.println(es.toString());
        }
    }

    public static void main(String[] args) {

    }
}

Implement the UncaughtExceptionHandler interface in the Solution class, which must:
1. Interrupt the thread that threw the exception.
2. Display the exception's stack trace, starting with the innermost exception.

new Exception("ABC", new RuntimeException("DEF", new IllegalAccessException("GHI"))) Example output: java.lang.IllegalAccessException: GHI java.lang.RuntimeException: DEF java.lang.Exception: ABC

Wymagania:

The Solution class must implement the Thread.UncaughtExceptionHandler interface.
After calling uncaughtException(), you must interrupt the thread that threw the exception.
Then display the exception stack trace, starting with the innermost exception.
Messages should be displayed in this format: "<exception class>: <exception message>".

package com.codegym.task.task25.task2512; /* Charting our own course */ import java.util.Arrays; import java.util.Collections; import java.util.List; public class Solution implements Thread.UncaughtExceptionHandler { @Override public void uncaughtException(Thread t, Throwable e) { t.interrupt(); List<StackTraceElement> list = Arrays.asList(e.getStackTrace()); Collections.reverse(list); for(StackTraceElement es :list){ System.out.println(es.toString()); } } public static void main(String[] args) { } }

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Lisa

Poziom 41

3 marca 2022, 17:26

When I tested your code (with exceptions CG suggested) there was zero output. You should created nested exceptions. EG.

Solution s = new Solution();
Thread.currentThread().setUncaughtExceptionHandler(s);
throw new Exception("ABC", new RuntimeException("DEF", new IllegalAccessException("GHI")));

then in your ueh the Throwable e is what you need to look at. It is the description of the outer exception and it contains a cause (the next Throwable in the chain - that again is the description and contains a cause...)

Gellert Varga

Poziom 23 , Szekesfehervar, Hungary

3 marca 2022, 22:03

After some experimentation and reading about it, I came up with these: e.printStackTrace() - prints the chain of nested exceptions, and the causes of the exceptions e.getCause() - get the cause of the exception e.getCause().getCause() - get the cause of the cause of the exception but unfortunately I don't know how to determine how deep the exceptions' nesting is. (I found that getStackTrace is not good for this purpose.)

Gellert Varga

Poziom 23 , Szekesfehervar, Hungary

3 marca 2022, 22:16

I finally solved it with a "while" loop.:)